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Finding the Fourth Proportional to 489,089.10, 685,968.90 and 489,089.10

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Solution

The fourth proportional to 489,089.10, 685,968.90 and 489,089.10 is: 685,968.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,089.10 : 685,968.90 = 489,089.10 : x
  2. Step 2: Convert to fraction form
    489,089.10/685,968.90 = 489,089.10/x
  3. Step 3: Cross multiply
    489,089.10x = 685,968.90 × 489,089.10
  4. Step 4: Simplify right side
    489,089.10x = 335,499,911,928.99
  5. Step 5: Solve for x
    x = 335,499,911,928.99/489,089.10
  6. Step 6: Final answer
    x = 685,968.90

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.